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Lithium negative electrode, preparation method and application thereof

A lithium negative electrode and a technology for preparation steps, applied in the field of lithium negative electrode and its preparation, can solve problems such as inability to effectively protect metal lithium, and achieve the effects of good cycle performance and improved cycle performance

Inactive Publication Date: 2020-12-29
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a lithium negative electrode and a preparation method thereof, which are used to solve the problem that the existing protective layer cannot effectively protect lithium metal

Method used

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  • Lithium negative electrode, preparation method and application thereof
  • Lithium negative electrode, preparation method and application thereof
  • Lithium negative electrode, preparation method and application thereof

Examples

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Embodiment 1

[0048] The cross-sectional structure of the lithium negative electrode provided in this embodiment is as follows: figure 1 Shown, wherein, protective layer comprises the polyimide of 87 mass parts, the LiBF of 10 mass parts 4 and 3 parts by mass of isophorone to a thickness of 1 μm.

[0049] The preparation method of the lithium negative electrode provided in this embodiment includes the following steps:

[0050] First, dissolve 4,4 diaminodiphenyl ether and pyromellitic dianhydride in the solvent NMP with a molar ratio of 1.01:1, and stir and react at 10°C for 5 hours to obtain polyimide; take 87 parts by mass polyimide with 10 parts by mass of LiBF 4 and 3 parts by mass of isophorone, mixed and stirred evenly, and the protective layer slurry was obtained after filtering the insoluble matter; finally, the protective layer slurry was coated on the surface of the lithium metal layer by dipping and pulling method, and then dried in a vacuum oven at 40 ° C. drying to obtain a ...

Embodiment 2

[0052] The cross-sectional structure of the lithium negative electrode provided in this embodiment is as follows: figure 1 Shown, wherein, protective layer comprises the PVDF-HFP of 90 mass parts, the LiPF of 8 mass parts 4 and 2 parts by mass of Solvesso 150 with a thickness of 0.6 μm.

[0053] The preparation method of the lithium negative electrode provided in this embodiment includes the following steps:

[0054] Dissolve 90 mass parts of PVDF-HFP in solvent NMP, add 8 mass parts of LiPF 4 and 2 parts by mass of Solvesso150, stirred evenly, and the protective layer slurry was obtained after filtering the insoluble matter; the protective layer slurry was coated on the surface of the metal lithium layer by casting method, and dried in a blast drying oven at 40°C to obtain a lithium negative electrode .

Embodiment 3

[0056] The cross-sectional structure of the lithium negative electrode provided in this embodiment is as follows: figure 1 As shown, wherein the protective layer includes 50 parts by mass of PEDOT, 45 parts by mass of LiFSI and 5 parts by mass of lithium dodecyl sulfate, with a thickness of 0.5 μm.

[0057] The preparation method of the lithium negative electrode provided in this embodiment includes the following steps:

[0058] Dissolve 50 parts by mass of PEDOT in the solvent toluene, add 45 parts by mass of LiFSI and 5 parts by mass of lithium dodecyl sulfate, stir evenly, and obtain a protective layer slurry after filtering the insoluble matter; The layer slurry is coated on the surface of the metal lithium layer, and dried in a blast drying oven at 30° C. to obtain a lithium negative electrode.

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Abstract

The invention provides a lithium negative electrode, a preparation method and application thereof. According to the invention, a lithium negative electrode is provided and comprises a metal lithium layer and N protective layers sequentially stacked on the surface of the metal lithium layer, wherein the number set of the protective layers is marked as S = {1,..., N-1, N}, N is greater than or equalto 1, the direction from the first protective layer to the Nth protective layer is the direction gradually away from the metal lithium layer, and at least the Nth protective layer comprises a leveling agent; according to the lithium negative electrode provided by the invention, the leveling agent is added into the protective layer far away from the outermost layer of the metal lithium layer, so that the thickness of the protective layer is uniformly distributed, the problem of cracking is avoided, the metal lithium layer can be effectively protected, and the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a lithium negative electrode, a preparation method and application thereof, and relates to the technical field of lithium ion batteries. Background technique [0002] In recent years, with the sharp increase in human energy demand and the increasing pollution of fossil fuels, people increasingly need to develop some new energy and related equipment to alleviate or solve these problems. Since its birth in the 1990s, lithium-ion batteries have been widely used in electronic products such as mobile phones, notebook computers, and digital cameras due to their advantages such as long cycle life, high cell voltage, no memory effect, and environmental friendliness. Lithium-ion batteries are mainly composed of electrolyte, separator, positive electrode and negative electrode, and the most commonly used negative electrode active material is graphite. The theoretical specific capacity of graphite is 372mAh / g. At present, the actual spec...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/38H01M4/62H01M4/02
CPCH01M4/134H01M4/1395H01M4/382H01M4/62H01M2004/027Y02E60/10
Inventor 陈锡龙赵伟李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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